Browsing Faculty of Design and Creative Technologies (Te Ara Auaha) by Author "Takiguchi, H"

Comparison study of VLBI and GPS carrier phase frequency transfer - Part II -

Takiguchi, H; Koyama, Y; Ichikawa, R; Gotoh, T; Ishii, A; Hobiger, T (National Institute of Information and Communications Technology (NIICT), 2009)

To show the frequency stability of local baseline, we carried out long term VLBI experi- ment together with GPS and DMTD measurement. And, we compared the results provided from these three techniques. The results are ...

Comparison study of VLBI and GPS carrier phase frequency transfer using IVS and IGS data

Takiguchi, H; Koyama, Y; Ichikawa, R; Gotoh, T; Ishii, A; Hobiger, T; Hosokawa, M (National Institute of Information and Communications Technology (NIICT), 2008)

We compare the frequency transfer pre- cision between VLBI and GPS carrier phase using IVS and IGS observation data in order to confirm the potential of VLBI time and frequency transfer. The results show that VLBI time ...

Comparison with GPS Time Transfer and VLBI Time Transfer

Takiguchi, H; Hobiger, T; Ishii, A; Ichikawa, R; Koyama, Y (AUT UniversityNational Institute of Information and Communications Technology (NIICT), 2007)

To compare the results with Global Po- sitioning System (GPS) Time Transfer and Very Long Baseline Interferometry (VLBI) Time Trans- fer, we carried out the geodetic VLBI experi- ments for four times. The averaged formal ...

Contribution of Warkworth 12m VLBI radio telescope to New Zealand geodesy

Takiguchi, H; Gulyaev, S; Natusch, T; Weston, S; Woodburn, L (The Geoscience Society of New Zealand, 2011)

The Institute for Radio Astronomy and Space Research (IRASR) of Auckland University of Technology (AUT) launched the New Zealand's first and only research capable radio telescope (WARK12M) near Warkworth which is located ...

Crustal deformations associated with the great Sumatra-Andaman earthquake deduced from continuous GPS observation

Hashimoto, M; Choosakul, N; Hashizume, M; Takemoto, S; Takiguchi, H; Fukuda, Y; Frjimori, K (TerraPub, 2006)

We analyzed continuous GPS data from more than 20 sites in Asia, Australia and islands in Indian Ocean in order to detect crustal deformations associated with the Sumatra-Andaman earthquake of December 26, 2004. Coseismic ...

Development of the compact VLBI system for calibrating GNSS and EDM devices

Ichikawa, R; Ishii, A; Takiguchi, H; Takefuji, K; Ujihara, H; Koyama, Y; Kondo, T; Kurihara, S; Miura, Y; Kawabata, R; Kokado, K; Machida, M; Takashima, K; Fujisaku, J; Tanimoto, D; Nozawa, K (National Institute of Information and Communications Technology (NICT), 2010)

We are developing a compact VLBI (Very Long Baseline Interferometry) system with 1.6 m diameter aperture dish in order to provide reference baseline lengths for calibration. The reference baselines are used to validate ...

Evaluation of a laser-pumped Cs gas-cell frequency standard on geodetic VLBI

Ishii, A; Ichikawa, R; Takiguchi, H; Kuboki, H; Sekido, M; Koyama, Y; Ohuchi, Y (Geodetic Society of Japan, 2008)

The laser-pumped Cs gas-cell type atomic frequency standard (hereafter, we called the "Cs gas-cell oscillator") , this was developed in recent years, has a stability between a hydrogen maser oscillator and a Cs beam-type ...

Evaluation of the new approach to improving compact-compact antenna baseline in VLBI

Takiguchi, H; Ishii, A; Ichikawa, R; Koyama, Y (National Institute of Information and Communications Technology (NICT), 2009)

No abstract

Fully automated VLBI analysis with c5++ for ultra-rapid determination of UT1

Hobiger, T; Otsubo, T; Sekido, M; Gotoh, T; Kubooka, T; Takiguchi, H (TERRAPUB, 2011)

VLBI is the only space-geodetic technique which gives direct access to the Earth's phase of rotation, i.e. universal time UT1. Beside multi-baseline sessions, regular single baseline VLBI experiments are scheduled in order ...

GPS observations in Thailand for hydrological applications

Takiguchi, H; Kato, T; Kobayashi, H; Nakaegawa, T (TERRAPUB, 2000)

We report the delineation of the onset of the Asian Monsoon based on GPS sensing of water vapor in Thailand. We conducted GPS observations at five sites in Thailand since March 1998 under the hydrological project called ...

Inter-comparison study of time and frequency transfer between VLBI and other techniques (GPS, ETS8(TCE), TW(DPN) and DMTD)

Takiguchi, H; Kimura, M; Kondo, T; Ishii, A; Hobiger, T; Ichikawa, R; Koyama, Y; Takahashi, Y; Nakagawa, F; Nakamura, M; Tabuchi, R; Tsuchiya, S; Hama, S; Gotoh, T; Fujieda, M; Aida, M; Li, T; Amagai, J (International VLBI Service (IVS), 2011)

We carried out the intercomparison ex- periments between VLBI and other techniques to show the capability of VLBI time and frequency transfer by using the current geodetic VLBI tech- nique and facilities as the summary of ...

Intercomparison between VLBI frequency transfer and other techniques

Takiguchi, H; Koyama, Y; Ichikawa, R; Gotoh, T; Ishii, A; Hobiger, T; Fujieda, M; Amagai, J; Hosokawa, M (National Institute of Information and Communications Technology (NICT), 2010)

No abstract

Mass-redistribution-induced crustal deformation of global satellite laser ranging stations due to non-tidal ocean and land water circulation

Takiguchi, H; Otsubo, T; Fukuda, Y; Takiguchi, H; Otsubo, T; Fukuda, Y (TerraPub, 2006)

The effect of the non-tidal ocean load (NTOL) and the continental water load (CWL) on crustal deformation are calculated for global satellite laser ranging (SLR) stations and on 4!×4! grids (only over the land). For the ...

Precise time transfer by Means of Geodetic VLBI Technique - Part II -

Takiguchi, H; Koyama, Y; Ichikawa, R; Ishii, A; Hobiger, T (The Geodetic Society of Japan, 2007)

No abstract.

Reduction of influences of the earth's surface fluid loads on GPS site coordinate time series

Takiguchi, H; Fukuda, Y (Geodetic Society of Japan, 2006)

Conspicuous periodic variations often appear in GPS site coordinate time series. These variations could be influenced by various loads, such as atmospheric, non-tidal ocean, continental water, and snow loads. To eliminate ...

Reduction of influences of the earth's Surface Fluid Loads on GPS Site Coordinate Time Series and Global Satellite Laser Ranging Analysis

Takiguchi, H; Otsubo, T; Fukuda, Y (American Geophysical Union, 2006)

Temporal change of surface loadings due to the mass redistribution of the fluid envelope of the Earth, deform the Earth and cause the coordinate changes of the observation sites. We estimated the crustal displacements due ...